In a sit-down on Ellen, Fox said, "[Reese] went into labor the day before I did, and all of the paparazzi followed her to Santa Monica. So when I went into labor, I went to Cedars [medical center] and nobody cared or knew or was there, and so I got in and out. I left the next day and nobody knew and it was a big secret for three weeks."

Fox was a little less candid, though, when DeGeneres asked if Noah looked more like her or her hubby Brian Austin Green, answering the question but not showing any pictures of her tiny tyke.

"He looks, I would say, 70 percent like Brian," Fox said. "He was his identical twin when he came out, and recently he's been getting chubbier and everyone's like 'Oh, he's so chubby; now he looks like you,' and I don't know how I should take that."